TRUGARD SHOWER WATERPROOF MEMBRANE - 330 SQFT TrugardVapor-Shield Membrane Roll - Fits Standard 3 sided 96" x 96" 7'h Shower. Discover Why Builders And Tile Contractors Are Calling Trugard#1 When It Comes To Waterproofing Your Tile Or Stone Shower. TrugardVapor-Shield is a pliable polyethylene waterproof membrane that is used in conjunction The advanced polyethylene material is crack-resistant You don't need to be a professional tile contractor to install Trugard.